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Designing high-performance propagation-compressing spaceplates using thin-film multilayer stacks.

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    Area of Science:

    • Optics and Photonics
    • Metasurface Technology
    • Nanophotonics

    Background:

    • Metasurfaces enable portable and functional flat optical devices.
    • Spaceplates are emerging elements that reduce spacing between metalenses, crucial for miniaturizing imaging systems.
    • Designing and evaluating spaceplates is challenging due to their dependence on transverse spatial frequency.

    Purpose of the Study:

    • To explore the behavior of general thin-film-based spaceplates using inverse-design techniques.
    • To investigate the relationship between compression factor and numerical aperture in spaceplate design.
    • To demonstrate the feasibility of creating capable spaceplates with realistic materials.

    Main Methods:

    • Employing inverse-design techniques for metasurface optimization.
    • Simulating and analyzing the optical response of thin-film spaceplates.
    • Fabricating and characterizing spaceplates using silicon and glass.

    Main Results:

    • Observed a trade-off between the compression factor (R) and numerical aperture (NA).
    • Achieved a compression factor of R=5.5 with NA=0.42.
    • Demonstrated a record compression factor of R=340 with NA=0.017.

    Conclusions:

    • Inverse design enables the creation of effective spaceplates.
    • Simple designs with common materials like silicon and glass are sufficient for capable monochromatic spaceplates.
    • These findings advance the miniaturization of optical imaging devices.